Ok, I may be overthinking this but Centre County 911's new P25 radio system has three emissions,
8K10F1D P25 Phase I C4FM data
8K10F1E P25 Phase I C4FM voice (P25 mode in RadioReference.com Database)
and then
8K70D1W P25 Linear Simulcast Modulation ASTRO (9.6 kbps in 12.5 kHz channelspace)
I understand the first two. What exactly is the third one? What does it do that the first two do not?
8K10F1D P25 Phase I C4FM data
8K10F1E P25 Phase I C4FM voice (P25 mode in RadioReference.com Database)
and then
8K70D1W P25 Linear Simulcast Modulation ASTRO (9.6 kbps in 12.5 kHz channelspace)
I understand the first two. What exactly is the third one? What does it do that the first two do not?